1 #ifndef _LINUX_HUGE_MM_H
2 #define _LINUX_HUGE_MM_H
4 extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
5 struct vm_area_struct *vma,
6 unsigned long address, pmd_t *pmd,
8 extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
9 pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
10 struct vm_area_struct *vma);
11 extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
12 unsigned long address, pmd_t *pmd,
14 extern pgtable_t get_pmd_huge_pte(struct mm_struct *mm);
15 extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
19 extern int zap_huge_pmd(struct mmu_gather *tlb,
20 struct vm_area_struct *vma,
22 extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
23 unsigned long addr, unsigned long end,
26 enum transparent_hugepage_flag {
27 TRANSPARENT_HUGEPAGE_FLAG,
28 TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
29 TRANSPARENT_HUGEPAGE_DEFRAG_FLAG,
30 TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
31 TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
32 #ifdef CONFIG_DEBUG_VM
33 TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
37 enum page_check_address_pmd_flag {
38 PAGE_CHECK_ADDRESS_PMD_FLAG,
39 PAGE_CHECK_ADDRESS_PMD_NOTSPLITTING_FLAG,
40 PAGE_CHECK_ADDRESS_PMD_SPLITTING_FLAG,
42 extern pmd_t *page_check_address_pmd(struct page *page,
44 unsigned long address,
45 enum page_check_address_pmd_flag flag);
47 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
48 #define HPAGE_PMD_SHIFT HPAGE_SHIFT
49 #define HPAGE_PMD_MASK HPAGE_MASK
50 #define HPAGE_PMD_SIZE HPAGE_SIZE
52 #define transparent_hugepage_enabled(__vma) \
53 (transparent_hugepage_flags & (1<<TRANSPARENT_HUGEPAGE_FLAG) || \
54 (transparent_hugepage_flags & \
55 (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) && \
56 (__vma)->vm_flags & VM_HUGEPAGE))
57 #define transparent_hugepage_defrag(__vma) \
58 ((transparent_hugepage_flags & \
59 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) || \
60 (transparent_hugepage_flags & \
61 (1<<TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG) && \
62 (__vma)->vm_flags & VM_HUGEPAGE))
63 #ifdef CONFIG_DEBUG_VM
64 #define transparent_hugepage_debug_cow() \
65 (transparent_hugepage_flags & \
66 (1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
67 #else /* CONFIG_DEBUG_VM */
68 #define transparent_hugepage_debug_cow() 0
69 #endif /* CONFIG_DEBUG_VM */
71 extern unsigned long transparent_hugepage_flags;
72 extern int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
73 pmd_t *dst_pmd, pmd_t *src_pmd,
74 struct vm_area_struct *vma,
75 unsigned long addr, unsigned long end);
76 extern int handle_pte_fault(struct mm_struct *mm,
77 struct vm_area_struct *vma, unsigned long address,
78 pte_t *pte, pmd_t *pmd, unsigned int flags);
79 extern int split_huge_page(struct page *page);
80 extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
81 #define split_huge_page_pmd(__mm, __pmd) \
83 pmd_t *____pmd = (__pmd); \
84 if (unlikely(pmd_trans_huge(*____pmd))) \
85 __split_huge_page_pmd(__mm, ____pmd); \
87 #define wait_split_huge_page(__anon_vma, __pmd) \
89 pmd_t *____pmd = (__pmd); \
90 spin_unlock_wait(&(__anon_vma)->root->lock); \
92 * spin_unlock_wait() is just a loop in C and so the \
93 * CPU can reorder anything around it. \
96 BUG_ON(pmd_trans_splitting(*____pmd) || \
97 pmd_trans_huge(*____pmd)); \
99 #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
100 #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
101 #if HPAGE_PMD_ORDER > MAX_ORDER
102 #error "hugepages can't be allocated by the buddy allocator"
104 extern int hugepage_madvise(unsigned long *vm_flags);
105 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
106 #define HPAGE_PMD_SHIFT ({ BUG(); 0; })
107 #define HPAGE_PMD_MASK ({ BUG(); 0; })
108 #define HPAGE_PMD_SIZE ({ BUG(); 0; })
110 #define transparent_hugepage_enabled(__vma) 0
112 #define transparent_hugepage_flags 0UL
113 static inline int split_huge_page(struct page *page)
117 #define split_huge_page_pmd(__mm, __pmd) \
119 #define wait_split_huge_page(__anon_vma, __pmd) \
121 static inline int hugepage_madvise(unsigned long *vm_flags)
126 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
128 #endif /* _LINUX_HUGE_MM_H */